<html>

<head>
    <style>
        html, body {
            padding: 0;
            margin: 0;
        }
        body {
            width: 100vw;
            height: 100vh;
        }
        #content {
            width: 200px;
            height: 200px;
        }
    </style>
</head>

    <body>
        <div id="content"></div>
    </body>

</html>